New crossfire user - Am I being bottlenecked?

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Thomas Watkins

Honorable
Oct 18, 2013
15
0
10,510
I've recently purchased a 2nd xfx 7970 black edition for pure fps increases. I still have a rather bad monitor though so I keep V-sync on as much as possible.
I've literally just installed it and ticked the box on catalyst to enable crossfire, I don't know if any other preparations are required.
World of Warcraft is pulling fps dips below 40 on occasion, which I find incredibly worrying considering it's treating it as if I still only have one card helping the load along.
I'm using a 850W XFX pro series PSU, wondering if I need to upgrade in order to see the full benefit of both of my cards. My question is, is my PSU causing my performance in crossfire to suck? I don't intend to do any overclocking on the cards. Here are my specs:
Summary
Operating System
Microsoft Windows 7 Home Premium 64-bit SP1
CPU
Intel Core i7 3770K @ 3.50GHz 42 °C
Ivy Bridge 22nm Technology
RAM
(2x4gb sticks) 8.00 GB Dual-Channel DDR3 @ 672MHz (9-9-9-24)
Motherboard
ASUSTeK COMPUTER INC. SABERTOOTH Z77 (LGA1155) 37 °C
Graphics
DELL ST2420L (1920x1080@60Hz)
AMD Radeon HD 7900 Series
AMD Radeon HD 7900 Series
Hard Drives
238GB M4-CT256M4SSD2 ATA Device (SSD)
1397GB Seagate ST31500341AS ATA Device (SATA) 38 °C
Optical Drives
TSSTcorp DVD+-RW TS-H653H ATA Device

I also have a h100i for my CPU and a fair few fans running.
Ideally I'd want to overclock the CPU a bit more to 4.3ghz but I have absolutely no idea how much breathing room my PSU is allowing me, or even if it's getting enough power as it is. No idea if I put them in the right lanes either. (Installation lanes below)

http://imgur.com/XnL9755

Also I am unaware if the Z77 sabre-tooth has crossfire specific bios settings, if it does, I haven't touched them.

Any insight would be greatly appreciated, having to buy 2x PSUs in one year would be a bummer, but It's better than not utilizing the extra £270 I spent to have crossfire.
 
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Chaosvortexx

Chaosvortexx

Commendable
Jun 28, 2016
11
1
1,520
Okay well let me tell you first off your power supply wattage is perfectly okay I doubt this is a PSU problem at all. Now what you're saying so far is you installed the second card slapped on the crossfire bridge and enabled crossfire. From that it seemed you did everything correctly. First you should check if the second card is seated in properly if that isn't the case and the crossfire bridge is on correctly then this is more than likely a software problem. The two games you listed WoW and SW don't seem to have crossfire support that actually takes advantage of crossfire. Another thing to note here is the fact that SLI/Crossfire while giving fps boost don't make it so that adding a second graphics card suddenly makes it two times the performance. Another thing you need to remember is you have to make profiles for the crossfire to work assuming the game supports it/is optimized for it. One more thing to add is since these games don't support crossfire they're going to continue stressing your first GPU so it's the one actually doing everything and rarely pull from your second one which explains the heat.

Here's a supposed fix for crossfire in WoW http://eu.battle.net/wow/en/forum/topic/7921982130

 
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